Agreed. Managers are empowered by organization and position. Leaders are empowered by inspiring and creating followers. They are diametric opposites in terms of mechanism and direction of power. Followers GIVE the leader power. Managers impose by force of position and control of organization power/money/etc.
The number of direct reports that function well as managed or led employees or any other organization hierarchy is about 5-7 but at most 10-12. This is a biological, neurological and psychological limit. It's also related to information theory and the UI-limits of the brain. It's related to chunking but also related to other limits of cognition and the finite number of hours in a day intersected with the minimal required cognitive focus/attention required to guide or manage an employee.
The number of direct reports that function well as managed or led employees or any other organization hierarchy is about 5-7 but at most 10-12. This is a biological, neurological and psychological limit. It's also related to information theory and the UI-limits of the brain. It's related to chunking but also related to other limits of cognition and the finite number of hours in a day intersected with the minimal required cognitive focus/attention required to guide or manage an employee.